aqua International Journal 19(1)

Description

COMPLETE ISSUE

Volume 19, Issue 1 – 21 January 2013

John E. Randall and Joseph D. DiBattista: A new species of damselfish (Pomacentridae) from the Indian Ocean, pp. 1-16

Abstract

The pomacentrid fish Chromis dimidiata (Klunzinger, 1871), type locality Red Sea, formerly believed to be wide-ranging into the Indian Ocean, is restricted to the Red Sea. The Indian Ocean population is described as a new species, Chromis fieldi. It differs in having modally 17 pectoral rays and 17 lateral-line scales, compared to modally 16 pectoral rays and 15 lateral-line scales for C. dimidiata, and the demarcation of the dark brown anterior part of the body from the white posterior part is convex, compared to nearly straight in C. dimidiata, and not as sharply defined dorsally and ventrally. Phylogenetic comparisons based on mitochondrial DNA (mtDNA) cytochrome b sequences support morphological differentiation with evolutionary separation of C. dimidiata sampled in the central Red Sea and C. fieldi sampled in the Indian Ocean (d = 0.019). These two species differ from the related C. iomelas Jordan & Seale, 1906 of the western and central Pacific in having modally 12 dorsal and anal fin soft rays (vs. 13 for C. iomelas), the demarcation of dark brown and white distinctly anterior to the origin of the anal fin, and d = 0.085 to d = 0.087 for cytochrome b.

AbstractDespite the abundance and diversity of callionymids in marine environments, information on the social structure and mating systems of the group are rare. Most research has suggested that callionymids are non-territorial, polygynous spawners where male mating opportunities are controlled by dominance hierarchies, which in turn, are governed by body size. Here, we investigate the social structure and reproductive behavior of Callionymus bairdi through observations of wild and captive fish. Males greater than 8 cm SL held territories ranging in size from 6.81-10.9 m2, within which, females maintained territories of 0.182-1.41 m2. Subordinate males were found to move freely through the territories of larger males and compete for mating opportunities with females. The number of subordinate males and females living within territorial boundaries correlated strongly with the size of the territory. Male alternative reproductive tactics, including female mimicry and saboteur males, are discussed.

Jose Tavera and Arturo Acero P.: Description of a new species of Hypoplectrus (Perciformes: Serranidae) from the Southern Gulf of Mexico, pp. 29-38

AbstractNine of the sixteen species of the western Atlantic genus Hypoplectrus (Serranidae) are currently recognized to be distributed in the Gulf of Mexico. Hypoplectrus atlahua n. sp. is only known from Tuxpan banks and Isla Lobos, Veracruz. It differs from the only other similarly colored species, H. nigricans (i.e black hamlet) in the number of gill rakers on the first arch, snout length, upper jaw length, pectoral and pelvic fins lengths, and coloration. It is a dark brown species, lacking nose spots, mask, caudal fin dark spots, peduncle saddle, and pectoral pigmentation, but has iridescent violet speckles and lines on cheeks and chest, and also a well-defined but rather small violet dot over the dorsal flat spine on the rear edge of the opercle.

Abstract43 species, 28 preserved in alcohol (including 19 spp. photographed) and 15 species not preserved (some still in aquarium), all photographed. From the upper basins of the rios Tieté, Paraná, Paraguay, Tapajós, Xingú and Tocantins (the last three in the Serra do Roncador).

Additional information

Weight

0.25 kg

Dimensions

26.6 × 20.3 × 0.3 cm

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SCOPE

aqua is an international journal which publishes original scientific articles in the fields of systematics, taxonomy, bio-geography, ethology, ecology, and general biology of fishes since 1994. Papers on freshwater, brackish, and marine fishes will be considered. aqua is fully refereed and aims at publishing manuscripts within 2-4 months of acceptance. In view of the importance of colour patterns in species identification and animal ethology, authors are encouraged to submit colour illustrations in addition to descriptions of coloration. It is our aim to provide the international scientific community with an efficiently published journal meeting high scientific and technical standards.

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The editors welcome the submission of original manuscripts which should be sent in digital format to the scientific editor.
Full length research papers and short notes will be considered for publication. There are no page charges and colour illustrations will be published free of charge. Authors will receive one free copy of the issue in which their paper is published and an e-print in PDF format.

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Since 2003 Aquapress publishes a series of Special Publications, which are produced at irregular intervals. All Special Publications have about 100 or more pages and are available separately from regular issues of aqua. Enquiries about subscriptions and prices should be sent to the publisher at the address given here above or by e-mail, using the contact form